Records identified from*: Databases (n = 128) Registers (n = 0)

Records removed before screening: Duplicate records removed (n = 34)

Records screened (n = 94)

Records excluded** (n = 08)

Reports sought for retrieval (n = 86)

Reports not retrieved (n = 0)

Reports assessed for eligibility (n = 86)

Studies included in review (n = 86) Reports of included studies (n = 86)